text: Where the acyl chloride moiety takes priority, acyl chlorides are named by taking the name of the parent carboxylic acid, and substituting -yl chloride for -ic acid. Thus:
  :butyric acid (CHCOOH)  →  butyryl chloride (C3H7COCl)
  (Idiosyncratically, for some trivial names, -oyl chloride substitutes -ic acid.  For example, pivalic acid becomes pivaloyl chloride and acrylic acid becomes acryloyl chloride.  The names pivalyl chloride and acrylyl chloride are less commonly used, although they are arguably more logical.)
  When other functional groups take priority, acyl chlorides are considered prefixes — chlorocarbonyl-: